import java.io.*;

public class Read implements Runnable {
    DataInputStream in;

    public void setDataInputStream(DataInputStream in) {
        this.in = in;
    }

    public void run() {
        double result = 0;
        while (true) {
            try {
                result = in.readDouble();
                System.out.println("圆的面积:" + result);
                System.out.print("输入园的半径(放弃请输入N):");
            } catch (IOException e) {
                System.out.println("与服务器已断开" + e);
                break;
            }
        }
    }
}